31423453320402 has 384 divisors, whose sum is σ = 81966416313600. Its totient is φ = 8575497216000.

The previous prime is 31423453320349. The next prime is 31423453320407. The reversal of 31423453320402 is 20402335432413.

31423453320402 is a `hidden beast` number, since 3 + 14 + 234 + 5 + 3 + 3 + 2 + 0 + 402 = 666.

It is not an unprimeable number, because it can be changed into a prime (31423453320407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 7242093549 + ... + 7242097887.

It is an arithmetic number, because the mean of its divisors is an integer number (213454209150).

Almost surely, 2^{31423453320402} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31423453320402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40983208156800).

31423453320402 is an abundant number, since it is smaller than the sum of its proper divisors (50542962993198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31423453320402 is a wasteful number, since it uses less digits than its factorization.

31423453320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874 (or 4871 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 31423453320402 its reverse (20402335432413), we get a palindrome (51825788752815).

The spelling of 31423453320402 in words is "thirty-one trillion, four hundred twenty-three billion, four hundred fifty-three million, three hundred twenty thousand, four hundred two".